The suffix -al indicates which functional group?

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Multiple Choice

The suffix -al indicates which functional group?

Explanation:
The ending -al is used in naming organic compounds for aldehydes. An aldehyde has a carbonyl group at the end of the carbon chain, written as R-CHO, where the carbonyl carbon is bonded to at least one hydrogen. This terminal carbonyl sets aldehydes apart from other groups: alcohols use -ol, ketones use -one (carbonyl inside the chain), and carboxylic acids use -oic acid (carboxyl -COOH). For example, formaldehyde (methanal) and acetaldehyde (ethanal) illustrate this suffix.

The ending -al is used in naming organic compounds for aldehydes. An aldehyde has a carbonyl group at the end of the carbon chain, written as R-CHO, where the carbonyl carbon is bonded to at least one hydrogen. This terminal carbonyl sets aldehydes apart from other groups: alcohols use -ol, ketones use -one (carbonyl inside the chain), and carboxylic acids use -oic acid (carboxyl -COOH). For example, formaldehyde (methanal) and acetaldehyde (ethanal) illustrate this suffix.

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